fix: correct business framing - website design & development is primary, email is secondary

Update hello-world post, homepage, about page, and zh landing to say
website design & development (primary) + email hosting (side offering),
not 'email-hosting business'.

src/pages/about.astro

@@ -10,8 +10,9 @@ import { SITE } from '../config';
     I'm {SITE.author} ({SITE.handle}), a full-stack developer and DevOps engineer
     based in Malaysia. I build web applications — PHP/CodeIgniter, Java/Spring,
     JavaScript/TypeScript/React — and self-host a ~140-container homelab
-    (Docker, Traefik, nginx, Cloudflare tunnels) that runs my own email-hosting
-    business for Malaysian SMEs.
+    (Docker, Traefik, nginx, Cloudflare tunnels). I run Hoelee Enterprise, a
+    website design & development business for Malaysian SMEs (email hosting is
+    a side offering, not the focus).
   </p>
   <p>
     This blog is my living portfolio: I document what I build, from self-hosted